/*************************************************************
 *
 *  MathJax/extensions/TeX/HTML.js
 *  
 *  Implements the \href, \class, \style, \cssId macros.
 *
 *  ---------------------------------------------------------------------
 *  
 *  Copyright (c) 2010-2012 Design Science, Inc.
 * 
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

MathJax.Extension["TeX/HTML"] = {
  version: "2.0"
};

MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {

  var TEX = MathJax.InputJax.TeX;
  var TEXDEF = TEX.Definitions;
  
  TEXDEF.Add({
    macros: {
      href:    'HREF_attribute',
      "class": 'CLASS_attribute',
      style:   'STYLE_attribute',
      cssId:   'ID_attribute'
    }
  });

  TEX.Parse.Augment({

    //
    //  Implements \href{url}{math}
    //
    HREF_attribute: function (name) {
      var url = this.GetArgument(name),
          arg = this.GetArgumentMML(name);
      this.Push(arg.With({href:url}));
    },
    
    //
    //  Implements \class{name}{math}
    //
    CLASS_attribute: function (name) {
      var CLASS = this.GetArgument(name),
          arg   = this.GetArgumentMML(name);
      if (arg["class"] != null) {CLASS = arg["class"] + " " + CLASS}
      this.Push(arg.With({"class":CLASS}));
    },

    //
    //  Implements \style{style-string}{math}
    //
    STYLE_attribute: function (name) {
      var style = this.GetArgument(name),
          arg   = this.GetArgumentMML(name);
      // check that it looks like a style string
      if (arg.style != null) {
        if (style.charAt(style.length-1) !== ";") {style += ";"}
        style = arg.style + " " + style;
      }
      this.Push(arg.With({style: style}));
    },

    //
    //  Implements \cssId{id}{math}
    //
    ID_attribute: function (name) {
      var ID  = this.GetArgument(name),
          arg = this.GetArgumentMML(name);
      this.Push(arg.With({id:ID}));
    },

    //
    //  returns an argument that is a single MathML element
    //  (in an mrow if necessary)
    //
    GetArgumentMML: function (name) {
      var arg = this.ParseArg(name);
      if (arg.inferred && arg.data.length == 1)
        {arg = arg.data[0]} else {delete arg.inferred}
      return arg;
    }

  });
  
  MathJax.Hub.Startup.signal.Post("TeX HTML Ready");
  
});

MathJax.Ajax.loadComplete("[MathJax]/extensions/TeX/HTML.js");
